论文标题
URSA星系的主要协会。 VI：富含气体矮星系的相对缺乏
The Ursa Major Association of Galaxies. VI: A relative dearth of gas-rich dwarf galaxies
论文作者
论文摘要
我们使用盲目的VLA-D阵列调查确定了星系中星系中星系的HI质量功能，该调查由54个横向模式组成，涵盖了中心以及URSA主要体积的郊区。计算出的HI质量函数具有最合适的Schechter参数θ^* = 0.19 +/- 0.11 mpc^{ - 3}，log（m^* _ {hi}/m _ {\ odot}）= 9.8 +/- 0.8 +/- 0.8和α= -0.92 +/-0.92 +/-0.16。高质量端取决于互补的，有针对性的WSRT调查，低质量端由盲目VLA调查确定。斜率比hipass的斜率（α= -1.37 +/- 0.03 +/- 0.05）和αFalfa（α= -1.33 +/- 0.02）HI质量功能明显浅，这些斜率在较大的范围内，并且覆盖了宇宙的更大范围：相对群体缺乏质量的群体，这些质量是高度的。斜率上的这种差异强烈暗示了HI质量函数斜率的环境依赖性。
We determined the HI mass function of galaxies in the Ursa Major association of galaxies using a blind VLA-D array survey, consisting of 54 pointings in a cross pattern, covering the centre as well as the outskirts of the Ursa Major volume. The calculated HI mass function has best-fitting Schechter parameters θ^* = 0.19+/-0.11 Mpc^{-3}, log(M^*_{HI}/M_{\odot}) = 9.8+/-0.8 and α = -0.92+/-0.16. The high-mass end is determined by a complementary, targeted WSRT survey, the low-mass end is determined by the blind VLA survey. The slope is significantly shallower than the slopes of the HIPASS (α = -1.37+/-0.03+/-0.05) and ALFALFA (α = -1.33+/-0.02) HI mass functions, which are measured over much larger volumes and cover a wider range of cosmic environments: There is a relative lack of low HI mass galaxies in the Ursa Major region. This difference in the slope strongly hints at an environmental dependence of the HI mass function slope.
